Attached Link: http://ourworld.cs.com/posershadowcat/site/index.htm

I think texturing, lighting, and camera angles are a good place to start. DON'T BE AFRAID TO TRY!!!! Because, really, what's the worst that could happen? Play with all of the dials & buttons, render alot to see what affect a dial has on the image. Use the hands on learning method. Ron's website is good for beginners and so's mine :)